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What is the approximate enthalpy of reaction (in kJ mol^-1) for the following combustion reaction CH4(g) + O2 (g) --> CO2(g) + H2O (g) using the given bond enthalpies (given bond enthalpies (given in kJ mol^-1)? (O-H)459 (C-H) 411 (O-O) 142 (O=O 494. (C-O) 358 (C=O) 799 a) -688 b) -378 c) -1095 d) -1692